Sharp XE-A201 Service Manual page 10

XE-A201UC
5) Receiving sequence flow
LINE ESTABLISHED
DSR ON ?
YES
DCD ON ?
RXRDY ?
YES
READ 1 CHARACTER
EOT ?
ENQ ?
ACK ?
END CODE
NAK ?
BUFFER FULL ?
NO
HALF
NO NO
DUPLEX ?
YES
NO
YES
YES
AFTER
RECEIVE
NO
ER-OFF
COMMAND
YES
YES
DTR OFF
YES
RTS OFF
YES DSR OFF
YES
YES
INITIAL
LINE ESTABLISHED
– 9 –
NO
YES
TIME OUT ?
30sec
ID. ENQ ∞
NO
ACK or
TIME OUT ?
NAK 4 sec
TEXT 7 sec
YES
NO
SEND TEXT
YES
LINE ESTABLISHED
NO
DTR OFF
RTS OFF
RECEIVE ERROR